Testing YCSB

1

cd YCSB-0.15.0

The main directories are described as follows:

• bin: contains an executable YCSB file, which is the command line interface for user operations. The main logic of the YCSB is as follows: Parse the command lines, set the Java environment, load Java-libs, encapsulate the commands into executable Java commands, and execute the commands.
• workloads: contains various workload templates, which can be customized.

The default six test scenarios are as follows:

• workloada: read/write balancing, 50%/50%, reads/writes
• workloadb: read-intensive, 95%/5%, reads/writes
• workloadc: read-only, 100%, reads
• workloadd: reads the most recently written records, 95%/5%, reads/insert
• workloade: inter-cell scanning, 95%/5%, scan/insert
• workloadf: read/written records balancing, 50%/50%, reads/insert
• workload_template: parameter list template

1

bin/ycsb load mongodb -threads 100 -P workloads/workloada

Figure 1 Data loading command output

Figure 2 Data loading command output

If "Return=OK" is returned, the data is imported successfully.

The parameters are described as follows:

ycsb [command] [database] [options]

• command can be any of the following:

  load: loads the test data.

  run: starts the test.

  shell: indicates the interaction mode.

• database specifies the database scenario for the test, such as mongodb, cassandra, or memcached.
• options can be any of the following:

  -P file: specifies the workload file, which can be a relative or absolute path.

  -cp path: specifies an additional Java classpath.

  -jvm-args args: specifies an additional JVM parameter.

  -p key=value: sets the YCSB configuration item, which will overwrite the configuration item in the workload file.

  -s: displays the intermediate status during the running to stderr.

  -target n: indicates the total number of operations in 1s.

  -threads n: sets the number of concurrent test threads of the YCSB client. The default value is 1, indicating a single thread.